Boiler



Nov.8, 1927.

r. w. DAHLQUIST BOILER Filed Sept. 4, 1924 THEODORE W. DAHLQ'UIST,DEDHAM, MASSACHUSETTS BOILER.

Application filed September 4, 1924. Serial Ito. 735,886.

This invention relates to a hot water boiler and more particularly to ahot water boiler of the character commonly used in barber shops and inwhich the heat is ape plied directly to the bottom of the boiler forheating the water therein.

The invention has for its object to provide a boiler of the characterspecified, with means whereby hot water may be obtained to within aminimum time after the heat has been applied to the bottom of theboiler.

In the usual construction of hot water boiler employed in barber shops,considerable time elapses between! the lighting of the gas burner forheating \the bottom-of the boilerand the flow of hot water of thedesired temperature from the tap or hot water faucet, because of thefact that as these'boilers are now constructed it is necessary to heatthe entire body of water within the boiler.

In accordance with the present invention, provision is made forconfining the heat applied to the bottom of the boiler to action upona'relatively small portion of the water within the boiler, and forpreventing the heat in this water from being dissipated by convectionupwardly h throughout the main body of water within the boiler, so asthereby to cause such relatively small body of water to become rapidlyheated to a high temperature, and provision is made for conducting thewater thus heated directly to the hot Water outlet pipe from the boiler3 leading to the hot Water tap or faucet. Provision is also preferablymade for automatically ett'ccting discharge of the hot water into theboiler when the hot water faucet or tap is closed to thereby establishcirculation within the boiler and permit the entire body of water withinthe boiler to be gradually heated.

- These and other features of the invention will be hereinafterdescribed and particularly pointed out in the claims at the end of thisspecification. a

In the drawing illustrating the preferred embodiment of the invention,Fig. 1 is a vertical section of the improved boiler, and

Fig. 2 is a plan of the'boiler shown in Fig. 1

with the cover or upper part thereof removed.

Referring to the drawing, the body portion 10 of the boiler. illustratedtherein may and preferably will be constructed of copper in the usualmanner and of the usual 'cured to the body portion of the boiler 10 andwhich is provided with nipples 17, 18,

brazed or otherwise secured to the exterior. thereof to register withenlarged holes 20,

21 in the top or head portion of the boiler, and with which the usualconnection is made to the cold water supply pipe 22 and to the hot wateroutlet pipe 23 leading from the boiler to the hot water tap or faucet.

In order that hot water may be obtained at the hot water tap or faucetin a minimum time after the gas burner 14 is lighted, provision is madefor confining the action of the gas burner in heating the water to thesmall body of water in the immediate vicinity of the bottom of theboiler, and also for preventing the dissipation of the heat in supp bodyof water upwardly into the main bo y of the cold waterwithin the boiler,both by conduction and by convection currents. Provision is also madefor directly connecting this relatively small body of water in theimmediate vicinity ofthe bot tom of the boiler, with the hot wateroutlet pipe 23 leading from the boiler, as herein shown, by apartitionmember 27 preferably in the form of a metal dome of double wallconstruction and having the upper and lower walls 28, 29, thereofseparated and confining a body of air to render thedome heat insulating.The partition member or dome27 is supported within the boiler near thebottonrthereof and as herein shown is supported upon a plurality ofU-shaped supporting"- members 30 resting directly upon the bottom of theboiler, and which are of such height as to form between the lower wall29 of the dome 27 and the bottom of the boiler, a'chamber for containinga relatively small proportion of the watercoutents of the hQllQI. Themetal dome 27 is the bottom of the boiler and to extend to i near theside wall 34 thereofand to form with the side wall 34: a. narrow annularopening 36 through which cold water may flow into the space or chamberbelow the dome when the heated water from such space is drawn from theboiler. The heated Water in the space or chamber below the dome isconducted directly to the hot Water outlet pipe 23 leading from theboiler pre'ferably through a conduit or pipe 38 which is preterablyscrewed into a threaded hole tapped at the proper angle in a centralblock .40 in and forming a part of the metal dome illustrated in Fig. l,and the upper end of the conduit or pipe 38 is arranged to terminateWithin the nipple 18 so that the pipe is operatively supported by thedome 2? and confined at its upper end from movement "by the nipple 18.The pipe 38 is preferably provided With an supply pipe 22 is preferablybent illustrated in Fig. 1, and arranged to extend downwardly to nearthe bottom of the boiler and to terminate in close proximity to theannular inlet opening 36 surrounding the -marginal portion of the metaldome 27.

With this construction it Will be observed that the metal dome 27,substantially cover ing the entire bottom of the boiler, serves as.

a partition, to not only insulate the body 01 Water beneath it which israpidly heated by conduction from the gas flame througl the bottom ofthe boiler, but also serves to revent convection currents being estal.

ished, which otherwise would dissipate the heat from the relativelysmall body of Water beneath the dome, to the main body of cold WaterWithin the boiler and as a result of this construction, Within anexceedingly short time after the gas of the burner is lighted, hot Watermay be drawn directly from the hot Water tap or faucet. Thisc0nstruction,: thrretore, is of particular advanta e in the t i e ofboilers used in barber shops in Which the demands for hot water are moreor less intermittent.

The openings 20, 21 in the top or cover member 16 of the boiler areconstructed of a sutlicient size to enable the bent portion of the coldWater supply pipe 22 to be readily inset-Led therethrough and also topermit the jacketed pipe 38 to be removed if occasion requires. I

In order to establish circulati n from the chamber or space below thedome or partltion member 27, in the even that the gas burner remainslighted and the hot Water faucet or tap closed, the upper end of theconduit or pipe is provided with a plurality of openings 50 throughwhich the heated water may pass outwardly into the main body of theboiler and in this manner establish a definite circulation from the m inneeaeea body of cold Water downwardly througli the annular inlet opening36 around the metal dome 27 and thence from the heated body of waterbeneath the metal dome upwardly through the pipe 38 and outwardlythrough the openings 50 into the main body of the boiler, thus servingto gradually heat up the main body of water Within the boiler.

While the preferred, form oi the invention has been illustrated anddescribed, it is to be understood that the invention may be ombodied inother forms within the scope or" the following claims.

Having thus described the invention What is claimed is:

1. The combination with a hot Water 1 n boiler having a head providedwith a cold water inlet and a hot water outlet, a partition within theboiler located. near the bottom thereof to term therewith a hot waterchamber within the boiler and to form With the sides of the boiler awater inlet for said chamber, a hot Water outlet pipe for said chamberattached to said partition and having its upper end extended into thehot Water outlet in the head of the boiler, a pipe surrounding theportion of thehot Water outlet pipe above said partition, and closed atits ends to form a closed insulating chainher about said hot wateroutlet pipe for substantially the length of the same above saidpartition, and a cold Water inlet pipe for said boiler extended from thecold Water inlet in the head of the boiler to near the water inlet forsaid hot Water chamber.

The combination with a hot Water boiler having-a head provided With acold water inlet and a hot Water outlet, a partition Within the boilerprovided with a closed air chamber located near the bottom of the boilerto term therewith a hot Water chamber within the boiler, a hot wateroutlet pipe for said hot water chamber attached to said partition andhaving its upper end extended into the hot Water outlet in the head ofthe boiler and provided with a Water outlet near said head, a pipesurrounding the hot Water outlet pipe for said chamber between theWillLCl' outlet in said hot Water outlet and said partition. and closedat its ends to form an air chamber about the hot Water outlet pipe forsaid chamber, and a cold Water inlet pipe for the boiler extended fromthe cold Water inlet in head. of the hot boiler to near the Water inletfor said water chan'iber.

$3. In a hot water boiler having a head provided with a cold water inletand a hot water outlet, a unit coi'istruction insertable into the boilerand comprising a partition of sumller diameter than said boiler, a pipeattached to said partition, and a pipeof larger diameter surroundingtheportion of the first-mentioned pipe above the partition and closed atits ends the said unit when till mes es within the 'hoiiei eo-opemtingthere- Io town 51, hot "miteT-chmnber at the botthvholler and to formwithin the boilor :1 1m. 1 for mid Water to said hot Water A vhzmihoz,:1 (iii-out passage from said chamher into the hot water outlet for theboiler ind u, f" i; insulating itli'l chamber between ,i e mid diver'{mSSflgQ and the water in the for suwtnhtiul.iy the lei'igth of thesaid 'ipehie oi" inserted into from a hot Water boiler compartition oismaller diameter than F into which the unit is to he in aunt eonstmeteci to form with the hot tom of the boiler a hot water chamber and to alsoform within the boiler a passage for cold water to said hot waterchamber attached to said partition to communicate with said chamberend asecond pipe of larger diameter mounted upon the first-mentinned pipeabove the partition and closed at its opposite ,pnds to foym a closed:iii' chamber about said first-mentioned pipe between the upper endthereof and seiti partition.

In testimony whereof, I have signed my name to this specification.

THEODORE W. DAI'ILQUIST.

CERTIFICATE OF CORRECTION.

Patent No. 1,648,043. Granted November 8, 1927, to

THEODORE W. DAHLQUIST.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 3,line 18, claim 4, after the word "chamber" insert a comma and the wordsa pipe"; and that the said Letters Patent should be read with thiscorrection therein that the same may conform to the record of the casein the Patent Office.

Signed and sealed this 29th day of October, A. D. 1929.

M. J. Moore, (Seal) Acting Commissioner of Patents.

